Is stink bugs beneficial insects or pests? Why do you call it Sister smelly?

Stink bugs, if the size of a woman's fingernails, the whole body is dark brown, because of its release of odor, it is called stinky bugs, fart bugs, shit fart bugs, smelly big sisters. So is it a beneficial insect or a pest? According to the textual research of agricultural data, stink bugs are a general term for a class of insects with abnormal wing changes. There are about 30,000 species, of which more than 90% are pests. However, insects also have a side to be beneficial. Beneficial insect species include preying on small insects, insectivorous stink bugs beneficial to agriculture, nine incense insects for traditional Chinese medicine, sweet-scented osmanthus cicadas for edible, soft-shelled turtles and pine algae that feed on young fish.

Most of the stink bugs are pests, and 3-5 generations occur every year in the cotton area of the Yellow River valley, overwintering with eggs in withered branches and stubble such as alfalfa, broad bean, pomegranate and apple, as well as in withered branches and boll shells of cotton. Hatched in the first and middle of April and feathered in the last ten days. The period from mid-June to mid-July is the peak period of damage. Adults have phototaxis. Cotton fields with dense growth lay more eggs and like high temperature and rain. The temperature and relative humidity of 25 ℃-30 ℃ are more than 80%, which is suitable for egg hatching and reproduction, and the damage is the most serious in cotton fields near alfalfa fields, green manure fields or cotton fields with many weeds.

In the suburbs of Beijing, smelly eldest sister mainly harms pears, peaches, apples and other fruit trees, the damage rate is generally about 15% to 25%, the damage rate to the fruit is as high as 70%, making the fruit become "hericium Erinaceus", "pear pimple", bitter taste and loss of edible value. In urban areas, smelly elder sister harms willow, elm, mulberry, poplar, locust, Eucommia ulmoides, paulownia, pomegranate and other greening trees and flowers. They absorb the juice of buds, petals, leaves, tender leaves and fruits, which greatly reduce the effect of greening and beautification.

The smelly eldest sister can concentrate on hunting and killing the smelly eldest sister when she is overwintering; take measures such as blocking tree holes and shaving old skin in early spring; gently shake the tree trunk at noon in summer to kill the smelly eldest sister in time after landing; in addition, it is necessary to prevent and cure the smelly eldest sister during the nymph period, because during this period, smelly elder sister can only crawl and cannot fly. At present, the use of stinky Sister's natural enemy Chunxiangou egg wasp to carry out biological control of smelly Sister in the Forestry Biological Control Center has entered the experimental stage. The field investigation showed that the egg parasitism rate of Toona sinensis eggs was high, the average parasitism rate of tea wing Toona sinensis eggs was 47.22%, and that of pear Toona sinensis eggs was 30.56%, which was the natural nemesis of stinky sister.

The rice stink egg wasp parasites on the rice brown bugs' eggs and is single parasitic. According to the investigation in the paddy field in Hangzhou, Zhejiang Province in July 1957, 97.1% of rice brown bugs were parasitized by black egg wasps, of which the parasitism rate of this species was 94.2%, and that of rice bug small black egg wasps was 2.9%. The sex ratio of this species is 81.54%. In addition, according to the examination of Wangcheng, Hunan, among the 67.24% parasitism rate of rice brown bugs, this species is 41.75% (Zhou Renlian, 1955). The parasitic egg is black before Eclosion and yellowish after Eclosion. The Eclosion hole is irregularly round at the top of the egg, with irregular incisions, striped debris connected to the periphery of the hole, and creamy egg inclusions on both sides of the egg. The adult bees mate immediately after Eclosion, and the time is very short, only 3-5 seconds. When spawning, constantly use antennae to explore the top and side of the egg, lay eggs from the side, lay an egg for about 30 seconds, and then lay eggs on another host. After feeding with fresh eggs, the period from oviposition to Eclosion was 7 days, and the average number of wasps was 22. The life span of adult bees is 4 days, and the supply of dilute honey liquid can be extended to 20-22 days.